1 /*
2 * Copyright (C) 2011 Fujitsu. All rights reserved.
3 * Written by Miao Xie <miaox@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
18 */
19
20 #ifndef __DELAYED_TREE_OPERATION_H
21 #define __DELAYED_TREE_OPERATION_H
22
23 #include <linux/rbtree.h>
24 #include <linux/spinlock.h>
25 #include <linux/mutex.h>
26 #include <linux/list.h>
27 #include <linux/wait.h>
28 #include <linux/atomic.h>
29
30 #include "ctree.h"
31
32 /* types of the delayed item */
33 #define BTRFS_DELAYED_INSERTION_ITEM 1
34 #define BTRFS_DELAYED_DELETION_ITEM 2
35
36 struct btrfs_delayed_root {
37 spinlock_t lock;
38 struct list_head node_list;
39 /*
40 * Used for delayed nodes which is waiting to be dealt with by the
41 * worker. If the delayed node is inserted into the work queue, we
42 * drop it from this list.
43 */
44 struct list_head prepare_list;
45 atomic_t items; /* for delayed items */
46 int nodes; /* for delayed nodes */
47 wait_queue_head_t wait;
48 };
49
50 struct btrfs_delayed_node {
51 u64 inode_id;
52 u64 bytes_reserved;
53 struct btrfs_root *root;
54 /* Used to add the node into the delayed root's node list. */
55 struct list_head n_list;
56 /*
57 * Used to add the node into the prepare list, the nodes in this list
58 * is waiting to be dealt with by the async worker.
59 */
60 struct list_head p_list;
61 struct rb_root ins_root;
62 struct rb_root del_root;
63 struct mutex mutex;
64 struct btrfs_inode_item inode_item;
65 atomic_t refs;
66 u64 index_cnt;
67 bool in_list;
68 bool inode_dirty;
69 int count;
70 };
71
72 struct btrfs_delayed_item {
73 struct rb_node rb_node;
74 struct btrfs_key key;
75 struct list_head tree_list; /* used for batch insert/delete items */
76 struct list_head readdir_list; /* used for readdir items */
77 u64 bytes_reserved;
78 struct btrfs_delayed_node *delayed_node;
79 atomic_t refs;
80 int ins_or_del;
81 u32 data_len;
82 char data[0];
83 };
84
btrfs_init_delayed_root(struct btrfs_delayed_root * delayed_root)85 static inline void btrfs_init_delayed_root(
86 struct btrfs_delayed_root *delayed_root)
87 {
88 atomic_set(&delayed_root->items, 0);
89 delayed_root->nodes = 0;
90 spin_lock_init(&delayed_root->lock);
91 init_waitqueue_head(&delayed_root->wait);
92 INIT_LIST_HEAD(&delayed_root->node_list);
93 INIT_LIST_HEAD(&delayed_root->prepare_list);
94 }
95
96 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
97 struct btrfs_root *root, const char *name,
98 int name_len, struct inode *dir,
99 struct btrfs_disk_key *disk_key, u8 type,
100 u64 index);
101
102 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
103 struct btrfs_root *root, struct inode *dir,
104 u64 index);
105
106 int btrfs_inode_delayed_dir_index_count(struct inode *inode);
107
108 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
109 struct btrfs_root *root);
110
111 void btrfs_balance_delayed_items(struct btrfs_root *root);
112
113 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
114 struct inode *inode);
115 /* Used for evicting the inode. */
116 void btrfs_remove_delayed_node(struct inode *inode);
117 void btrfs_kill_delayed_inode_items(struct inode *inode);
118
119
120 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
121 struct btrfs_root *root, struct inode *inode);
122 int btrfs_fill_inode(struct inode *inode, u32 *rdev);
123
124 /* Used for drop dead root */
125 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
126
127 /* Used for readdir() */
128 void btrfs_get_delayed_items(struct inode *inode, struct list_head *ins_list,
129 struct list_head *del_list);
130 void btrfs_put_delayed_items(struct list_head *ins_list,
131 struct list_head *del_list);
132 int btrfs_should_delete_dir_index(struct list_head *del_list,
133 u64 index);
134 int btrfs_readdir_delayed_dir_index(struct file *filp, void *dirent,
135 filldir_t filldir,
136 struct list_head *ins_list);
137
138 /* for init */
139 int __init btrfs_delayed_inode_init(void);
140 void btrfs_delayed_inode_exit(void);
141
142 /* for debugging */
143 void btrfs_assert_delayed_root_empty(struct btrfs_root *root);
144
145 #endif
146